The most likely cultural trait responsible for the difference in workweek length between the U.S. and the Netherlands in 2020 is:
The U.S. culture prioritizes capitalism, while the Netherlands’ culture prioritizes health and welfare.
This response highlights the differences in cultural values related to work-life balance and economic priorities in each country. The U.S. often emphasizes higher work hours and productivity, while the Netherlands tends to value social welfare and personal well-being, leading to shorter average work weeks.